Simagina won the silver medal at the 2004 Summer Olympics. She was then more or less away from the international scene the next two seasons. She did not start at the 2005 World Championships, despite having entered the competition, and gave birth to a daughter in the summer of 2006. She returned to competition in early 2007.
Her personal best jump is 7.27 metres, achieved in July 2004 in Tula.
On April 24, 2012, The Russian athletics federation sanctioned Meleshina with a 2-year ban from competition retroacted to Feb. 21, 2012, following a positive drug test in February of the same year. Thus, eliminating her bid for the 2012 Olympic Summer Games in London.